I guess I was lucky as I managed to rebook flights with Easijet for the same dates as the original Globespan flights so at least my whole holiday is not lost
We also fly from Glasgow and go a few times every year. I find Travel Republic good. We were actually booked to fly out with Globespan on 23rd December but had booked through Travel Republic. They have an insurance put in place when you book which covers against airline failure and we have been told we will get a full refund for the cost of the flights. When you put your dates into the search box it comes up with all available flights including Thomson and Thomas Cook. What I liked about Globespan was that you were not tied to a week or a fortnight (Thomson and Thomas Cook only fly from Glasgow once a week) but could choose to go for just a few days. My last short break booked through Travel Republic I flew out with Easijet and back with Thomson.